| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.link; |
| |
| import org.apache.tapestry.IAction; |
| import org.apache.tapestry.IActionListener; |
| import org.apache.tapestry.IBinding; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.RenderRewoundException; |
| import org.apache.tapestry.Tapestry; |
| import org.apache.tapestry.engine.ILink; |
| |
| /** |
| * A component for creating a link that is handled using the action service. |
| * |
| * [<a href="../../../../../ComponentReference/ActionLink.html">Component Reference</a>] |
| * |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * |
| **/ |
| |
| public abstract class ActionLink extends AbstractLinkComponent implements IAction |
| { |
| /** |
| * Returns true if the stateful parameter is bound to |
| * a true value. If stateful is not bound, also returns |
| * the default, true. |
| * |
| * <p>Note that this method can be called when the |
| * component is not rendering, therefore it must |
| * directly access the {@link IBinding} for the stateful |
| * parameter. |
| * |
| **/ |
| |
| public boolean getRequiresSession() |
| { |
| IBinding statefulBinding = getStatefulBinding(); |
| |
| if (statefulBinding == null) |
| return true; |
| |
| return statefulBinding.getBoolean(); |
| } |
| |
| public ILink getLink(IRequestCycle cycle) |
| { |
| String actionId = cycle.getNextActionId(); |
| |
| if (cycle.isRewound(this)) |
| { |
| getListener().actionTriggered(this, cycle); |
| |
| throw new RenderRewoundException(this); |
| } |
| |
| return getLink(cycle, Tapestry.ACTION_SERVICE, new Object[] { actionId }); |
| } |
| |
| public abstract IBinding getStatefulBinding(); |
| |
| public abstract IActionListener getListener(); |
| } |